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1-38 About the PathBuilder S24x, 26x, and 27x switch
Hardware Components
-48V Ringer/Power Supply Card and Enclosure
Introduction One -48V ringer/power supply card and enclosure is required per PathBuilder S24x,
26x, and 27x switch node for
• Analog DSPM/FXS cards
• DSPM/E&M cards using interface signaling types II, III, and V.
DSPM/E&M card with an interface signaling of type I does not require a -48V
ringer/power supply card and enclosure.
Description The -48V ringer/power supply card comes in an enclosure, which you must install in
the PathBuilder S24x, 26x, and 27x switch if you are field upgrading to support the
Voice option.
New PathBuilder S24x, 26x, and 27x switch nodes ordered with the voice option
ship with the -48V ringer/power supply factory installed.
The -48V ringer/power supply card supports the following:
• 12 E&M ports, or 6 DSPM/E&M cards
• 4 FXS ports, or 2 DSPM/FXS cards
Function The -48V ringer/power supply card rings up to four phones at a time.
-48V Ring/Power
Supply Types
There are two versions of the -48V ringer/power supply: Standard and Enhanced.
• The Standard -48V ringer/power supply (see Figure 1-22) can support two
FXS cards.
• The Enhanced -48V ringer/power supply (see Figure 1-23) can support six
FXS cards. (Available in the Fall of 1998.)
Jumper Definitions The -48V ringer/power supply card has two sets of jumpers for various requirements.
• One set of jumpers to enable or disable the -48V ringer supply output (should
not be changed from its default setting of enabled.)
• One set of jumpers to control the frequency of the ring supplied to the DSPM/
FXS card: 25 Hz (US) or 50 Hz (Europe).
For more information see Figure 1-22 and Figure 1-23.
Jumper Locations The jumpers for 25 or 50 Hz ring frequency are located on the -48V ringer/power
supply card as shown in Figure 1-22 and Figure 1-23.
Installing Jumpers Figure 1-22 and Figure 1-23 show jumper positions on the -48V ringer/power supply
card for 25 or 50 Hz ring frequency and how to install the jumpers for 25 or 50 Hz
ring frequency.